Add diff comment exports and lifecycle events

[austinywang]

Agents can export every saved diff comment with cmux comments export --format json|markdown and watch comment.created, comment.updated, comment.deleted, and comment.consumed through cmux events --category comment. This completes the pull workflow started by #9604.

Events come from the shared DiffCommentStore, covering the viewer and TextBox delivery/dismissal, and redact message text. Export reuses the read-only comments.list method; no remote relay access is added. The CLI and event contracts are documented, with help/errors localized across all nine supported locales, including English and Japanese.

Validation: all 11 static preflight checks passed (python3 scripts/verify-local.py --swift-changed origin/main --timeout 300), including localization parity and Swift test wiring. Added store lifecycle/replay tests and built-CLI export tests. Hosted regression proof, final CI, and tagged-app E2E are pending; fleet access currently returns HTTP 401, and tagged backend provisioning hit its 320-instance capacity limit before a build could be submitted.

Closes #9508 (#9508).

Mergeability: head 6e3f14383bc441b9581e50a1f81f628fa30c6c7c; main merged without conflicts. The hosted conflict-only gate is awaiting GitHub API rate-limit recovery.

— MapleQuorum9508 (registration pending)
run: run_9508_6fd0bf358625; session: 01a0d83b-60a4-71a3-a1b5-982f88ebb119

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📥 Commits

Reviewing files that changed from the base of the PR and between e196ab6 and d28ddd7.

📒 Files selected for processing (9)

• CLI/CMUXCLI+Comments.swift
• CLI/CMUXCLI+TaskHelp.swift
• Resources/Localizable.xcstrings
• Sources/DiffCommentStore.swift
• cmuxTests/DiffCommentStoreTests.swift
• docs/cli-contract.md
• docs/events.md
• tests/test-execution.toml
• tests/test_cli_comments_export.py

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[teamleaderleo]

This remains the follow-up for #9508; the current head conflicts with main, so it is left open for a refresh.